Asymmetric synthesis of 2-alkyl-3-phosphonopropanoic acid derivatives via Rh-catalyzed asymmetric hydrogenation
摘要:
The commercially available ferrocene-based diphosphine ligand (S-c,S-Fc)-TaniaPhos was found to be highly effective in the Rh-catalyzed asymmetric hydrogenation of 3-aryl-2-(phosphonomethyl)propenates. Excellent enantioselectivity (90-98% ee) and high catalytic activity (S/C up to 1000) have been achieved, which represents the best results reported so far. (C) 2011 Elsevier Ltd. All rights reserved.
Asymmetric synthesis of 2-alkyl-3-phosphonopropanoic acid derivatives via Rh-catalyzed asymmetric hydrogenation
摘要:
The commercially available ferrocene-based diphosphine ligand (S-c,S-Fc)-TaniaPhos was found to be highly effective in the Rh-catalyzed asymmetric hydrogenation of 3-aryl-2-(phosphonomethyl)propenates. Excellent enantioselectivity (90-98% ee) and high catalytic activity (S/C up to 1000) have been achieved, which represents the best results reported so far. (C) 2011 Elsevier Ltd. All rights reserved.
A newclass of chiral ferrocenyl diphosphine ligands with an imidazole ring, (Rc,SFc)-ImiFerroPhos, has been prepared from acylferrocenes through a five-step transformation and successfully applied in the Rh-catalyzed asymmetric hydrogenation of various 3-aryl-substituted 2-phosphonomethylpropenoates, in which a series of chiral 3-phosphono-2-arylmethylpropanoic acid derivatives were achieved in ee
Simple and Advantageneous Stereoselective Synthesis of (<i>Z</i>)-Allyl Phosphonates Starting from Baylis–Hillman Adducts
作者:Biswanath Das、Nisith Bhunia、Kongara Damodar
DOI:10.1080/00397911.2011.561396
日期:2012.9
Baylis-Hillman adducts 3-hydroxyl-2-methylene alkanoates have been converted in one pot into the corresponding (Z)-allyl phosphonates by treatment with FeCl3 and trialkyl phosphites in toluene under reflux. The products are formed in excellent yields (88-98%) within 1-1.5 h. The process is highly convenient and efficient, cost-effective, and remarkably stereoselective.
Asymmetric Synthesis of 2-Alkyl-3-phosphonopropanoic Acids via P−C Bond Formation and Hydrogenation
作者:Pallavi A. Badkar、Nigam P. Rath、Christopher D. Spilling
DOI:10.1021/ol701500s
日期:2007.8.1
Allylic acetates, formed by the acetylation of Baylis Hillman adducts, undergo addition of phosphorus nucleophiles to give stereoselectively the Z-unsaturated esters. TFA cleavage of the tert-butyl ester and asymmetric hydrogenation of the unsaturated acid yields the phosphono alkyl propanoic acid moiety, commonly found in phosphonate- and phosphinate-based enzyme inhibitors.
Synthesis and reactions of 3-substituted-2-phosphomethyl acrylates